Quick reference: what wire gauge do you need for a given amperage? Based on NEC Table 310.16, 75°C insulation, copper and aluminum conductors.
| Amps | Copper | Aluminum | Breaker | Common Use |
|---|---|---|---|---|
| 15A | 14 AWG | 12 AWG | 15A | Standard lighting and outlet circuits |
| 20A | 12 AWG | 10 AWG | 20A | Kitchen, bathroom, garage circuits |
| 30A | 10 AWG | 8 AWG | 30A | Dryers, water heaters, small AC units |
| 40A | 8 AWG | 6 AWG | 40A | Electric ranges, large AC units |
| 50A | 6 AWG | 4 AWG | 50A | Ranges, hot tubs, EV chargers, sub-panels |
| 60A | 6 AWG | 4 AWG | 60A | Sub-panels, large EV chargers, heavy equipment |
| 70A | 4 AWG | 3 AWG | 70A | Large sub-panels, commercial equipment |
| 80A | 4 AWG | 2 AWG | 80A | Large sub-panels, industrial feeders |
| 100A | 1 AWG | 1/0 AWG | 100A | Main panels, large sub-panels, service entrance |
| 125A | 1/0 AWG | 2/0 AWG | 125A | Service entrance, large main panels |
| 150A | 2/0 AWG | 3/0 AWG | 150A | Service entrance, commercial panels |
| 200A | 4/0 AWG | 4/0 AWG | 200A | Residential service entrance, commercial feeders |